RFR: 8279651: [vectorapi] Implement the missing intrinsics for casting from integrals on x64 [v3]

[Quan Anh Mai]

> Hi,
> 
> This patch implements the remaining casts from integral types on x64.
> 
> Thank you very much.

Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:

  copyright year

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7002/files
  - new: https://git.openjdk.java.net/jdk/pull/7002/files/db8bb5d1..8401d390

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7002&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7002&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7002.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7002/head:pull/7002

PR: https://git.openjdk.java.net/jdk/pull/7002